diff --git a/modules/TDEVersion.cmake b/modules/TDEVersion.cmake
index 144c883..6edbc42 100644
--- a/modules/TDEVersion.cmake
+++ b/modules/TDEVersion.cmake
@@ -21,7 +21,7 @@ macro( tde_set_project_version )
 
   if( EXISTS ${CMAKE_SOURCE_DIR}/.tdescminfo )
     file( STRINGS ${CMAKE_SOURCE_DIR}/.tdescminfo VERSION_STRING REGEX "^Version:.+$" )
-    string( REGEX REPLACE "^Version: (R[0-9]+\.[0-9]+\.[0-9]+.*)$" "\\1" VERSION "${VERSION_STRING}" )
+    string( REGEX REPLACE "^Version: (R[0-9]+\\.[0-9]+\\.[0-9]+.*)$" "\\1" VERSION "${VERSION_STRING}" )
   endif()
 
   if( NOT VERSION )